I downloaded this skin-pack and extracted it in the path below. Mainly for the "Larger Dressing Room" skin.
However, when I select the skin and ctrl-click a piece of gear in-game to get into the dressing room, nothing has happened. It's exactly the same as before/original.

I have tried restarting the game a couple of times, and enable/disable it again but nothing changed. The only skin that works for me is the "Universal" skin-pack.

This is my file path: (all the skins folders are in the "JRR AzureGlass" folder)
C:\Users\xxx\Documents\The Lord of the Rings Online\ui\skins\JRR AzureGlass

Note: I am using ReShade, a shader/lightning tool to enhance my game's graphics.

having ui upside down right after selecting the skin is normal, look at installation step 5 : log off then relog your character.

however, with azure glass (except universal toolbar profile) depending your screen resolution you'll probably have to edit the skindefinition.xml file to put the main toolbar at the correct location (step 3).